摘要
首次在羌南地区的地层中发现了硅化木化石,对硅化木的基本特征进行了描述,根据孢粉组合特征,将地层定为中侏罗统夏里组,硅化木初步定为南洋杉。同时,孢粉组合的特征反映出该区中侏罗世具干旱古气候特点。结合前人晚三叠世硅化木的发现,对羌塘盆地的性质及演化提出了新的思考。
Recendy silicified wood has been for the first time discovered in Middle Jurassic strata in southern Qiangtang, and its basic features are described. According to the features of the sporopollen assemblage, the strata is determined to be the Middle Jurassic Gyari Formation and the silicified wood is preliminarily designated as Araucarioxylon. The features of the sporopollen assemblage reflect that the Middle Jurassic climate was dry and hot in this area. According to this discovery, combined with the silicified wood discovered by previous researchers in Triassic strata, the authors present new ideas about the Middle Jurassic tectonic evolution and character of the Qiangtang basin.
出处
《地质通报》
CAS
CSCD
北大核心
2007年第12期1692-1696,共5页
Geological Bulletin of China
基金
国家油气专项(编号:XQ2004-06)资助
关键词
硅化木
夏里组
中侏罗统
羌南坳陷
西藏
silicified wood
Gyari Formation
Middle Jurassic
southern Qiangtang depression
Tibet
